At least Romney COULD say, 'I made a mistake and will rectify it if elected' Obama can't.
Never happen BEFORE the elections. And Obama will point to it as Romney being on the side of ObamaCare - an argument his media minions will gleefully spread far and wide.
IMHO, we need to push for a brokered convention. Even if it doesn't happen, we need to take the fight, long and hard, to RINO elitists within the Party.